Abstract
The optical fiber with pure quartz core and Fluorine-doped glass cladding was made by POD (plasma outside deposition) technique in some corporations, while we used the creative technique of “overcladding F-doped tube onto quartz rod in high temperature” to make the optical fiber which has the same structure as that from POD, in order to research and compare the influence factors on the loss of the fiber, our research work includes contrast experiments on coating polymers with different refractive index and the concentricity error of the fiber core and cladding. The measurement results show us that there are great differences in the loss spectra between the different fiber samples. We made analysis of it.
Highlights
The optical fiber with pure quartz core and fluorinedoped glass cladding is a new kind of large core optical fiber that appeared in recent years
The influence of the first different point on the fiber loss is obvious, and what influence will come about the loss of fibre brought by another different point? We want to be quite clear on this point, make it clear, we conducted a series of researches to confirm that, which include: 1) We cover the fiber with high and low refractive index polymers separately, and compare the changes between their loss spectra; 2) The influence of the glass cladding thickness with low-refractive-index coat on fiber loss spectra; 3) The influence of the concentricity error between core and cladding on the fiber loss spectra
We know the light propagation constant n1k sin n1 2π sin, which transmits in the fiber, where n1 is refractive index of the fiber core, λ is the working wavelength, θ is the angle between vector k and the axis of the fiber, and each β is corresponding to one transmitting light module
Summary
The optical fiber with pure quartz core and fluorinedoped glass cladding is a new kind of large core optical fiber that appeared in recent years. At last we made the fiber with the same structure as that from POD by the technique of “overcladding F-doped tube onto the quartz rod in high temperature” [2], i.e. The technique is characterized by simplicity, low cost, high end product efficiency, large ratio of “core diameter/fiber diameter” and the low loss of the optical fiber, etc. The structure of this kind of fiber is quite different from that made by conventional technique. There are two main different points: one is that the fiber core material is pure quartz, another is that the cladding thickness is greatly reduced. We found the great changes on their loss spectra in the experiments, which shows that the influence of the above factors is obvious
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